Apparatus for recording the speed of gases.



M. BOUFPART. APPARATUS FOR RECORDING THE SPEED OF GASES. APPLICATIONFILED JAN.28, 1911' 1,050,333B Patented Jan. 14,1913.

2 SHEETSSHEET l.

M., BOUFPART. APPARATUS FOR RECORDING THE SPEED OF GASES. APPLICATIONFILED JAN. 28, 1911.

1,050,333, Patented Jan.14,1913.

2 SHEETS-SHEET 2.

UNITED STATES PATENT orrIoE.

MAURICE nourran'r, or HEns'rAL-Lnz-LrnGE, BELGIUM.

APPARATUS FOR RECORDING THE SPEED OF GASES.

Specification of Letters Patent Patented Jan. 14', 1913.

Applicationfiled January 28, 1911. Serial No."6 05,27 6.

T 0 all whomjt may concern Be it known that I, MAURICE Bonrmn'r, a subect of the King of Belgium, and a resident of 31 Place Coronmeuse,Herstal-lez- Liege, in the Kingdom of Belgium, have invented certain newand useful Improvements in Apparatus for Recording the Speed of Gases,of which the following is a specifica tion.

This invention has for its object to provide improved apparatus forrecording the complete information because the scale of speed ordelivery of gases, based on the principle of the Pilot tube, and itconsists in constructing the float of such apparatus of a special crosssectional contour whereby all the speeds are recorded on one and thesame scale. p

The improved apparatus has the following advantages: 1. The lowestspeeds as well as the highest speeds are recorded with the sameamplification, that is, the speed variations are recorded with the sameclearness in the bottom as in the upper part of the diagram. 2. Adiagram drawn by the apparatus on a sheet of unsealed paper, furnishesthe ordinates is constant andknown once for all. 3. An absolutelyaccurate calculation of the volume or total weight of gas which haspassed through the duct betweentwo given instants, can be easilyand-readily effected, because -it is merely necessary to integrate thearea of the diagram in which the scale of the ordinates is constant. 4:.There is no need to trouble'about any displacement of the zero line dueto the slow evaporation of the liquid. I

In the drawings :-F igure 1 is a diagram illustrating the crosssectional contour; of the float. form, Fig. 3 is a vertical section ofanother form, and Fig. 4 is a vertical section of is proportional to thesquare of the speed Fig. 2 is a vertical section of one} of the gas inthe duct -F. The bell will therefore rise or fall accordingly as thisspeed increases or. diminishes. words 'for every speed of the gas therewill be a correspondingly equilibrium of the bell.

The equation connecting the different p0- si-tions of equilibrium of thebell B with the varying speeds of the gas in the duct-F, obviouslyvaries with the cross sectional contour of the float 1 w In the improvedapparatus the float G has a cross sectional contour such that when thespeed of the gas .in the duct increases two,

three, four orfive fold,-etc., the .vertical.

movement of the bell above its lower position will'be 2, 3, 4 or 5;etc., times as great. In otherwords, the cross sectional contour of thefloat C is made such that the height IL through which the bell riseswill always be equal to the product of the speed of tlie gas in the ductmultiplied by a constant :'-thu's 5-K- hzv constant wherew:speed of theThe effect of the peculiar cross sectional contour of the oat mayalsobe-statedin the terms that all the speeds are recorded on. the sameuniform scale. The manner of determining this peculiar cross section isde-' scribed hereinafter..'

Forthe purpose of recording outside tankA the vertical niovenientsof thebell B, a rod G ending in a pen is connected to the bell B, whereby thepenis caused to draw a diagram whose ordinates represent the ver-' ticalmovements of the bell and consequently the speed of the gas in the duct'F on a stripof paper wound on a drum which is rotated at a uniformspeed by clockwork.

In the improved apparatus the means forv connecting the pen holder rod Gto the bell B, without allowing-any communication be- In other.

difi'erent position of tween the interior of the tank A and the jatmosphere, comprises a tubeJ forming partof the wall of the tank A. Thepen holder rod G extends through this tube, and is capable of movingfreely therein. The lower end of the tube J dips constantly into'areceptacle L containing a very dense liquid, such as mercury forinstance. 1

The diiterence-between the levels of the mercury inside and outside thetube J" is greater the. greater the difierence between the staticpressurein the duct F and the pressure of the atmosphere. Owing to thegreat density of mercury, the difference beiio tween there co'nsequ h iA 1pm 1 made i, m y din *siene eupietl li e (he liquil I Lil), itfollows that "m volumes is cellist: 11%.. xternal level (if the OILshows "i Slilll I the pressure filial. i is COllSiLLllL. Juhinc-reusingspeeds 70 the cross section ell 5h duet the level of theheguld 1n the small, the extraneous 3U pressure is y' uiie iheppreeit UI there is no need for any we such as is nee this type.

n? iii")? if the hell falls, but the external cloee ml; change.

%; head portion of Fig. 1'. represents (isiliien eff equilibrium of hehell. 7

rife-re are nil.- The level of the Thepesitio of; He the hell hasreached the fixed tank A Fig". 9} vel. At lililS 111011181113 the Weighti i displzicecl hy'the floatequal Weight p of the hell 56 Way the bulkof very higl 15 may he p eferred to in the axial line 03? 1 0 mi i1 thisseeend equation be borne in mind,

Fig. 3. he'i; ehe pr ceding equal-i011 Written for any The 6011513110511 She n on 5; equilibrium of the bell becomes 8 prises else thefollriwing zlCCdSzz Uz If therefore the vertical Each of the two Pi'mttube bran.

1E is-provideel with a Cock 4 i. he i i j V manner the/1 veah pair ofpoints he tank and 335 are ope ai ed by a whiny so i mi The two hr:nehee f eimultnneeu Wi li the ga The hmnel:

iiher by the equality lulaien "ll-PU", shell 9e 7 h the e 1p in. the aguide 02 emeilieally the feet that proportional between in ils veifipieviele (l Wl'hl'l' have usually eleseel and and emptying the 1efieciin g the eh lee a V has contour such bl each couple 01 points andIll." eennected together by the m5 equality of i-WVU velunies Uend U,shell satisfy the same time the euasien liquid,

f the? the ht .71 1110 wzizil heiween :LHOnllQl arhitiL-zuily (,l'lOSGLcone-tr, ht ehitemei' t the volumes U and U l (i II," have thefi'illewing I his the height through which 1e i'nei ecl 153mm ifsinitial position, the height throu ih Whieh the let; with he float) hasOwn ihitielposimier U is 1e fleet taken at the height: h, "20 .he volumeof revelution taken The riggl e sem s e pm cerrespondi duet. T e

:1; each ether hy and l 1 e 1 a Li between "he side of the fleet On the9:11 :l v w. 6 uihbriuw and me Well W hen l1 '1 eei-etely bounds the qhquul 111 inch. the fleet 1S immersed.

51'1"} 'T U 0 3 '3, T U 'v I 1' 1 1 1 0 1 me impz'evea mapzi i'ei;us;alewe-inmien Then M0111 ecl etel heunes the liquid in which "the Q 3. 1m7 15 the side of the hell. In

the multiple liquid type, the hell 21nd float clip in separate from eaehother,

This last equelzien -q .3. i l

355 he volume {341a L this wall isa fixed wall, and the float ashereinbefore defined is directly applicable to such apparatus.

. Pitot branch tubes extending from said duct,

one into the air space of said tank and the other into the air space ofsaid bell, a float attached to said bell, said float having a specialcontour determined by the following geometrical condition namely thatevery two points M and M connected together by the equality of twovolumes U and U shall satisfy simultaneously the equation Il /1 as setforth. 7

2. In apparatus for recording the speed of a gas passing through a duct,the combination of avclosed tank containing liquid and having an airspace, a bell immersed in said liquid and having an air space, two Pitotbranch tubes extending from said duct one into the air space of saidtank, and the other into the air space of said bell, a float attached tosaid bell, a receptacle containing a heavy liquid such as mercury,conimunieating at its top With. the space above the liquid in said tank,a tube immersed at its lower end in heavy liquid in said receptacle andopen to the atmosphere at its upper end, a penholder rodextendingthrough said tube, a rotating drum mounted upon the closedtank, and a record sheet on said drum.

In testimony whereof l have signed my name to this specification in thepresence of two subscribing Witnesses.

MAURICE BOUFFART.

Witnesses:

Lnomiae Livan, ALEX LALLEMAND,

